1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "code/vmreg.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allStatic.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "utilities/macros.hpp"
34
35 class AdapterHandlerEntry;
36 class AdapterFingerPrint;
37 class vframeStream;
38
39 // Runtime is the base class for various runtime interfaces
40 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
41 // shared functionality such as exception forwarding (C++ to
42 // Java exceptions), locking/unlocking mechanisms, statistical
43 // information, etc.
44
45 class SharedRuntime: AllStatic {
46 friend class VMStructs;
47
48 private:
49 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
50 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
51 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
52 static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, TRAPS);
53
54 // Shared stub locations
55
56 static RuntimeStub* _wrong_method_blob;
57 static RuntimeStub* _wrong_method_abstract_blob;
58 static RuntimeStub* _ic_miss_blob;
59 static RuntimeStub* _resolve_opt_virtual_call_blob;
60 static RuntimeStub* _resolve_virtual_call_blob;
61 static RuntimeStub* _resolve_static_call_blob;
62 static address _resolve_static_call_entry;
63
64 static DeoptimizationBlob* _deopt_blob;
65
66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
67 static SafepointBlob* _polling_page_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_return_handler_blob;
69
70 #ifdef COMPILER2
71 static UncommonTrapBlob* _uncommon_trap_blob;
72 #endif // COMPILER2
73
74 static nmethod* _cont_doYield_stub;
75
76 #ifndef PRODUCT
77 // Counters
78 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
79 #endif // !PRODUCT
80
81 private:
82 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
83 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
84 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
85
86 public:
87 static void generate_stubs(void);
88
89 // max bytes for each dtrace string parameter
90 enum { max_dtrace_string_size = 256 };
91
92 // The following arithmetic routines are used on platforms that do
93 // not have machine instructions to implement their functionality.
94 // Do not remove these.
95
96 // long arithmetics
97 static jlong lmul(jlong y, jlong x);
98 static jlong ldiv(jlong y, jlong x);
99 static jlong lrem(jlong y, jlong x);
100
101 // float and double remainder
102 static jfloat frem(jfloat x, jfloat y);
103 static jdouble drem(jdouble x, jdouble y);
104
105
106 #ifdef _WIN64
107 // Workaround for fmod issue in the Windows x64 CRT
108 static double fmod_winx64(double x, double y);
109 #endif
110
111 #ifdef __SOFTFP__
112 static jfloat fadd(jfloat x, jfloat y);
113 static jfloat fsub(jfloat x, jfloat y);
114 static jfloat fmul(jfloat x, jfloat y);
115 static jfloat fdiv(jfloat x, jfloat y);
116
117 static jdouble dadd(jdouble x, jdouble y);
118 static jdouble dsub(jdouble x, jdouble y);
119 static jdouble dmul(jdouble x, jdouble y);
120 static jdouble ddiv(jdouble x, jdouble y);
121 #endif // __SOFTFP__
122
123 // float conversion (needs to set appropriate rounding mode)
124 static jint f2i (jfloat x);
125 static jlong f2l (jfloat x);
126 static jint d2i (jdouble x);
127 static jlong d2l (jdouble x);
128 static jfloat d2f (jdouble x);
129 static jfloat l2f (jlong x);
130 static jdouble l2d (jlong x);
131 static jfloat i2f (jint x);
132
133 #ifdef __SOFTFP__
134 static jdouble i2d (jint x);
135 static jdouble f2d (jfloat x);
136 #endif // __SOFTFP__
137
138 // double trigonometrics and transcendentals
139 static jdouble dsin(jdouble x);
140 static jdouble dcos(jdouble x);
141 static jdouble dtan(jdouble x);
142 static jdouble dlog(jdouble x);
143 static jdouble dlog10(jdouble x);
144 static jdouble dexp(jdouble x);
145 static jdouble dpow(jdouble x, jdouble y);
146
147 #if defined(__SOFTFP__) || defined(E500V2)
148 static double dabs(double f);
149 #endif
150
151 #if defined(__SOFTFP__) || defined(PPC)
152 static double dsqrt(double f);
153 #endif
154
155 // Montgomery multiplication
156 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
157 jint len, jlong inv, jint *m_ints);
158 static void montgomery_square(jint *a_ints, jint *n_ints,
159 jint len, jlong inv, jint *m_ints);
160
161 #ifdef __SOFTFP__
162 // C++ compiler generates soft float instructions as well as passing
163 // float and double in registers.
164 static int fcmpl(float x, float y);
165 static int fcmpg(float x, float y);
166 static int dcmpl(double x, double y);
167 static int dcmpg(double x, double y);
168
169 static int unordered_fcmplt(float x, float y);
170 static int unordered_dcmplt(double x, double y);
171 static int unordered_fcmple(float x, float y);
172 static int unordered_dcmple(double x, double y);
173 static int unordered_fcmpge(float x, float y);
174 static int unordered_dcmpge(double x, double y);
175 static int unordered_fcmpgt(float x, float y);
176 static int unordered_dcmpgt(double x, double y);
177
178 static float fneg(float f);
179 static double dneg(double f);
180 #endif
181
182 // exception handling across interpreter/compiler boundaries
183 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
184 static address exception_handler_for_return_address(JavaThread* current, address return_address);
185
186 // exception handling and implicit exceptions
187 static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,
188 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
189 enum ImplicitExceptionKind {
190 IMPLICIT_NULL,
191 IMPLICIT_DIVIDE_BY_ZERO,
192 STACK_OVERFLOW
193 };
194 static void throw_AbstractMethodError(JavaThread* current);
195 static void throw_IncompatibleClassChangeError(JavaThread* current);
196 static void throw_ArithmeticException(JavaThread* current);
197 static void throw_NullPointerException(JavaThread* current);
198 static void throw_NullPointerException_at_call(JavaThread* current);
199 static void throw_StackOverflowError(JavaThread* current);
200 static void throw_delayed_StackOverflowError(JavaThread* current);
201 static void throw_StackOverflowError_common(JavaThread* current, bool delayed);
202 static address continuation_for_implicit_exception(JavaThread* current,
203 address faulting_pc,
204 ImplicitExceptionKind exception_kind);
205
206 // Post-slow-path-allocation, pre-initializing-stores step for
207 // implementing e.g. ReduceInitialCardMarks
208 static void on_slowpath_allocation_exit(JavaThread* current);
209
210 static void enable_stack_reserved_zone(JavaThread* current);
211 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
212
213 // Shared stub locations
214 static address get_poll_stub(address pc);
215
216 static address get_ic_miss_stub() {
217 assert(_ic_miss_blob!= nullptr, "oops");
218 return _ic_miss_blob->entry_point();
219 }
220
221 static address get_handle_wrong_method_stub() {
222 assert(_wrong_method_blob!= nullptr, "oops");
223 return _wrong_method_blob->entry_point();
224 }
225
226 static address get_handle_wrong_method_abstract_stub() {
227 assert(_wrong_method_abstract_blob!= nullptr, "oops");
228 return _wrong_method_abstract_blob->entry_point();
229 }
230
231 #ifdef COMPILER2
232 static void generate_uncommon_trap_blob(void);
233 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
234 #endif // COMPILER2
235
236 static address get_resolve_opt_virtual_call_stub() {
237 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
238 return _resolve_opt_virtual_call_blob->entry_point();
239 }
240 static address get_resolve_virtual_call_stub() {
241 assert(_resolve_virtual_call_blob != nullptr, "oops");
242 return _resolve_virtual_call_blob->entry_point();
243 }
244 static address get_resolve_static_call_stub() {
245 assert(_resolve_static_call_blob != nullptr, "oops");
246 return _resolve_static_call_blob->entry_point();
247 }
248
249 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
250 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
251 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
252
253 static nmethod* cont_doYield_stub() {
254 assert(_cont_doYield_stub != nullptr, "oops");
255 return _cont_doYield_stub;
256 }
257
258 // Counters
259 #ifndef PRODUCT
260 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
261 #endif // PRODUCT
262
263 // Helper routine for full-speed JVMTI exception throwing support
264 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
265 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
266
267 #if INCLUDE_JVMTI
268 // Functions for JVMTI notifications
269 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
270 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
271 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
272 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
273 #endif
274
275 // RedefineClasses() tracing support for obsolete method entry
276 static int rc_trace_method_entry(JavaThread* thread, Method* m);
277
278 // To be used as the entry point for unresolved native methods.
279 static address native_method_throw_unsatisfied_link_error_entry();
280
281 static void register_finalizer(JavaThread* thread, oopDesc* obj);
282
283 // dtrace notifications
284 static int dtrace_object_alloc(oopDesc* o);
285 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
286 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
287 static int dtrace_method_entry(JavaThread* thread, Method* m);
288 static int dtrace_method_exit(JavaThread* thread, Method* m);
289
290 // Utility method for retrieving the Java thread id, returns 0 if the
291 // thread is not a well formed Java thread.
292 static jlong get_java_tid(JavaThread* thread);
293
294
295 // used by native wrappers to re-enable yellow if overflow happened in native code
296 static void reguard_yellow_pages();
297
298 // Fill in the "X cannot be cast to a Y" message for ClassCastException
299 //
300 // @param thr the current thread
301 // @param caster_klass the class of the object we are casting
302 // @return the dynamically allocated exception message (must be freed
303 // by the caller using a resource mark)
304 //
305 // BCP must refer to the current 'checkcast' opcode for the frame
306 // on top of the stack.
307 // The caller (or one of its callers) must use a ResourceMark
308 // in order to correctly free the result.
309 //
310 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
311
312 // Fill in the "X cannot be cast to a Y" message for ClassCastException
313 //
314 // @param caster_klass the class of the object we are casting
315 // @param target_klass the target klass attempt
316 // @return the dynamically allocated exception message (must be freed
317 // by the caller using a resource mark)
318 //
319 // This version does not require access the frame, so it can be called
320 // from interpreted code
321 // The caller (or one of it's callers) must use a ResourceMark
322 // in order to correctly free the result.
323 //
324 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
325
326 // Resolves a call site- may patch in the destination of the call into the
327 // compiled code.
328 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
329
330 private:
331 // deopt blob
332 static void generate_deopt_blob(void);
333
334 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
335 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
336 bool& needs_ic_stub_refill, TRAPS);
337
338 public:
339 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
340
341 // Resets a call-site in compiled code so it will get resolved again.
342 static methodHandle reresolve_call_site(TRAPS);
343
344 // In the code prolog, if the klass comparison fails, the inline cache
345 // misses and the call site is patched to megamorphic
346 static methodHandle handle_ic_miss_helper(TRAPS);
347
348 // Find the method that called us.
349 static methodHandle find_callee_method(TRAPS);
350
351 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
352
353 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
354
355 private:
356 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
357 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
358
359 static Method* extract_attached_method(vframeStream& vfst);
360
361 #if defined(X86) && defined(COMPILER1)
362 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
363 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
364 #endif // X86 && COMPILER1
365
366 public:
367
368 // Read the array of BasicTypes from a Java signature, and compute where
369 // compiled Java code would like to put the results. Values in reg_lo and
370 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
371 // registers, those above refer to 4-byte stack slots. All stack slots are
372 // based off of the window top. SharedInfo::stack0 refers to the first usable
373 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
374 // 4-bytes higher.
375 // return value is the maximum number of VMReg stack slots the convention will use.
376 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
377
378 static void check_member_name_argument_is_last_argument(const methodHandle& method,
379 const BasicType* sig_bt,
380 const VMRegPair* regs) NOT_DEBUG_RETURN;
381
382 // Ditto except for calling C
383 //
384 // C argument in register AND stack slot.
385 // Some architectures require that an argument must be passed in a register
386 // AND in a stack slot. These architectures provide a second VMRegPair array
387 // to be filled by the c_calling_convention method. On other architectures,
388 // null is being passed as the second VMRegPair array, so arguments are either
389 // passed in a register OR in a stack slot.
390 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
391
392 static int vector_calling_convention(VMRegPair *regs,
393 uint num_bits,
394 uint total_args_passed);
395
396 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
397 // blobs. Unlike adapters in the tiger and earlier releases the code in these
398 // blobs does not create a new frame and are therefore virtually invisible
399 // to the stack walking code. In general these blobs extend the callers stack
400 // as needed for the conversion of argument locations.
401
402 // When calling a c2i blob the code will always call the interpreter even if
403 // by the time we reach the blob there is compiled code available. This allows
404 // the blob to pass the incoming stack pointer (the sender sp) in a known
405 // location for the interpreter to record. This is used by the frame code
406 // to correct the sender code to match up with the stack pointer when the
407 // thread left the compiled code. In addition it allows the interpreter
408 // to remove the space the c2i adapter allocated to do its argument conversion.
409
410 // Although a c2i blob will always run interpreted even if compiled code is
411 // present if we see that compiled code is present the compiled call site
412 // will be patched/re-resolved so that later calls will run compiled.
413
414 // Additionally a c2i blob need to have a unverified entry because it can be reached
415 // in situations where the call site is an inlined cache site and may go megamorphic.
416
417 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
418 // that the interpreter before it does any call dispatch will record the current
419 // stack pointer in the interpreter frame. On return it will restore the stack
420 // pointer as needed. This means the i2c adapter code doesn't need any special
421 // handshaking path with compiled code to keep the stack walking correct.
422
423 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
424 int total_args_passed,
425 int max_arg,
426 const BasicType *sig_bt,
427 const VMRegPair *regs,
428 AdapterFingerPrint* fingerprint);
429
430 static void gen_i2c_adapter(MacroAssembler *_masm,
431 int total_args_passed,
432 int comp_args_on_stack,
433 const BasicType *sig_bt,
434 const VMRegPair *regs);
435
436 // OSR support
437
438 // OSR_migration_begin will extract the jvm state from an interpreter
439 // frame (locals, monitors) and store the data in a piece of C heap
440 // storage. This then allows the interpreter frame to be removed from the
441 // stack and the OSR nmethod to be called. That method is called with a
442 // pointer to the C heap storage. This pointer is the return value from
443 // OSR_migration_begin.
444
445 static intptr_t* OSR_migration_begin(JavaThread *thread);
446
447 // OSR_migration_end is a trivial routine. It is called after the compiled
448 // method has extracted the jvm state from the C heap that OSR_migration_begin
449 // created. It's entire job is to simply free this storage.
450 static void OSR_migration_end(intptr_t* buf);
451
452 // Convert a sig into a calling convention register layout
453 // and find interesting things about it.
454 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
455 static VMReg name_for_receiver();
456
457 // "Top of Stack" slots that may be unused by the calling convention but must
458 // otherwise be preserved.
459 // On Intel these are not necessary and the value can be zero.
460 // On Sparc this describes the words reserved for storing a register window
461 // when an interrupt occurs.
462 static uint out_preserve_stack_slots();
463
464 // Stack slots that may be unused by the calling convention but must
465 // otherwise be preserved. On Intel this includes the return address.
466 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
467 static uint in_preserve_stack_slots();
468
469 // Is vector's size (in bytes) bigger than a size saved by default?
470 // For example, on x86 16 bytes XMM registers are saved by default.
471 static bool is_wide_vector(int size);
472
473 // Save and restore a native result
474 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
475 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
476
477 // Generate a native wrapper for a given method. The method takes arguments
478 // in the Java compiled code convention, marshals them to the native
479 // convention (handlizes oops, etc), transitions to native, makes the call,
480 // returns to java state (possibly blocking), unhandlizes any result and
481 // returns.
482 //
483 // The wrapper may contain special-case code if the given method
484 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
485 static nmethod* generate_native_wrapper(MacroAssembler* masm,
486 const methodHandle& method,
487 int compile_id,
488 BasicType* sig_bt,
489 VMRegPair* regs,
490 BasicType ret_type);
491
492 // A compiled caller has just called the interpreter, but compiled code
493 // exists. Patch the caller so he no longer calls into the interpreter.
494 static void fixup_callers_callsite(Method* moop, address ret_pc);
495 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
496
497 // Slow-path Locking and Unlocking
498 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
499 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
500
501 // Resolving of calls
502 static address resolve_static_call_C (JavaThread* current);
503 static address resolve_virtual_call_C (JavaThread* current);
504 static address resolve_opt_virtual_call_C(JavaThread* current);
505
506 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
507 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
508 oopDesc* dest, jint dest_pos,
509 jint length, JavaThread* thread);
510
511 // handle ic miss with caller being compiled code
512 // wrong method handling (inline cache misses)
513 static address handle_wrong_method(JavaThread* current);
514 static address handle_wrong_method_abstract(JavaThread* current);
515 static address handle_wrong_method_ic_miss(JavaThread* current);
516
517 static address handle_unsafe_access(JavaThread* thread, address next_pc);
518
519 #ifndef PRODUCT
520
521 // Collect and print inline cache miss statistics
522 private:
523 enum { maxICmiss_count = 100 };
524 static int _ICmiss_index; // length of IC miss histogram
525 static int _ICmiss_count[maxICmiss_count]; // miss counts
526 static address _ICmiss_at[maxICmiss_count]; // miss addresses
527 static void trace_ic_miss(address at);
528
529 public:
530 static uint _ic_miss_ctr; // total # of IC misses
531 static uint _wrong_method_ctr;
532 static uint _resolve_static_ctr;
533 static uint _resolve_virtual_ctr;
534 static uint _resolve_opt_virtual_ctr;
535 static uint _implicit_null_throws;
536 static uint _implicit_div0_throws;
537
538 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
539 static uint _jshort_array_copy_ctr; // Slow-path short array copy
540 static uint _jint_array_copy_ctr; // Slow-path int array copy
541 static uint _jlong_array_copy_ctr; // Slow-path long array copy
542 static uint _oop_array_copy_ctr; // Slow-path oop array copy
543 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
544 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
545 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
546 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
547
548 static uint _new_instance_ctr; // 'new' object requires GC
549 static uint _new_array_ctr; // 'new' array requires GC
550 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
551 static uint _find_handler_ctr; // find exception handler
552 static uint _rethrow_ctr; // rethrow exception
553 static uint _mon_enter_stub_ctr; // monitor enter stub
554 static uint _mon_exit_stub_ctr; // monitor exit stub
555 static uint _mon_enter_ctr; // monitor enter slow
556 static uint _mon_exit_ctr; // monitor exit slow
557 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
558
559 // Statistics code
560 // stats for "normal" compiled calls (non-interface)
561 static int64_t _nof_normal_calls; // total # of calls
562 static int64_t _nof_inlined_calls; // total # of inlined normal calls
563 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
564 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
565 // stats for compiled interface calls
566 static int64_t _nof_interface_calls; // total # of compiled calls
567 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
568
569 public: // for compiler
570 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
571 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
572 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
573 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
574 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
575 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
576 static void print_call_statistics(uint64_t comp_total);
577 static void print_ic_miss_histogram();
578
579 #endif // PRODUCT
580
581 static void print_statistics() PRODUCT_RETURN;
582 };
583
584
585 // ---------------------------------------------------------------------------
586 // Implementation of AdapterHandlerLibrary
587 //
588 // This library manages argument marshaling adapters and native wrappers.
589 // There are 2 flavors of adapters: I2C and C2I.
590 //
591 // The I2C flavor takes a stock interpreted call setup, marshals the
592 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
593 // code_begin(). It is broken to call it without an nmethod assigned.
594 // The usual behavior is to lift any register arguments up out of the
595 // stack and possibly re-pack the extra arguments to be contiguous.
596 // I2C adapters will save what the interpreter's stack pointer will be
597 // after arguments are popped, then adjust the interpreter's frame
598 // size to force alignment and possibly to repack the arguments.
599 // After re-packing, it jumps to the compiled code start. There are
600 // no safepoints in this adapter code and a GC cannot happen while
601 // marshaling is in progress.
602 //
603 // The C2I flavor takes a stock compiled call setup plus the target method in
604 // Rmethod, marshals the arguments for an interpreted call and jumps to
605 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
606 // setup. Compiled frames are fixed-size and the args are likely not in the
607 // right place. Hence all the args will likely be copied into the
608 // interpreter's frame, forcing that frame to grow. The compiled frame's
609 // outgoing stack args will be dead after the copy.
610 //
611 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
612 // also perform an official frame push & pop. They have a call to the native
613 // routine in their middles and end in a return (instead of ending in a jump).
614 // The native wrappers are stored in real nmethods instead of the BufferBlobs
615 // used by the adapters. The code generation happens here because it's very
616 // similar to what the adapters have to do.
617
618 class AdapterHandlerEntry : public CHeapObj<mtCode> {
619 friend class AdapterHandlerLibrary;
620
621 private:
622 AdapterFingerPrint* _fingerprint;
623 address _i2c_entry;
624 address _c2i_entry;
625 address _c2i_unverified_entry;
626 address _c2i_no_clinit_check_entry;
627
628 #ifdef ASSERT
629 // Captures code and signature used to generate this adapter when
630 // verifying adapter equivalence.
631 unsigned char* _saved_code;
632 int _saved_code_length;
633 #endif
634
635 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
636 address c2i_unverified_entry,
637 address c2i_no_clinit_check_entry) :
638 _fingerprint(fingerprint),
639 _i2c_entry(i2c_entry),
640 _c2i_entry(c2i_entry),
641 _c2i_unverified_entry(c2i_unverified_entry),
642 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)
643 #ifdef ASSERT
644 , _saved_code_length(0)
645 #endif
646 { }
647
648 ~AdapterHandlerEntry();
649
650 public:
651 address get_i2c_entry() const { return _i2c_entry; }
652 address get_c2i_entry() const { return _c2i_entry; }
653 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
654 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
655
656 address base_address();
657 void relocate(address new_base);
658
659 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
660
661 #ifdef ASSERT
662 // Used to verify that code generated for shared adapters is equivalent
663 void save_code (unsigned char* code, int length);
664 bool compare_code(AdapterHandlerEntry* other);
665 #endif
666
667 //virtual void print_on(outputStream* st) const; DO NOT USE
668 void print_adapter_on(outputStream* st) const;
669 };
670
671 class AdapterHandlerLibrary: public AllStatic {
672 friend class SharedRuntime;
673 private:
674 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
675 static AdapterHandlerEntry* _abstract_method_handler;
676 static AdapterHandlerEntry* _no_arg_handler;
677 static AdapterHandlerEntry* _int_arg_handler;
678 static AdapterHandlerEntry* _obj_arg_handler;
679 static AdapterHandlerEntry* _obj_int_arg_handler;
680 static AdapterHandlerEntry* _obj_obj_arg_handler;
681
682 static BufferBlob* buffer_blob();
683 static void initialize();
684 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
685 int total_args_passed,
686 BasicType* sig_bt,
687 bool allocate_code_blob);
688 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
689 public:
690
691 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
692 address i2c_entry,
693 address c2i_entry,
694 address c2i_unverified_entry,
695 address c2i_no_clinit_check_entry = nullptr);
696 static void create_native_wrapper(const methodHandle& method);
697 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
698
699 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
700 static void print_handler_on(outputStream* st, const CodeBlob* b);
701 static bool contains(const CodeBlob* b);
702 #ifndef PRODUCT
703 static void print_statistics();
704 #endif // PRODUCT
705
706 };
707
708 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP